This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A183543 #5 Mar 30 2012 18:57:12 %S A183543 3,6,11,10,18,19,32,17,29,30,50,31,52,53,87,28,47,48,79,49,81,82,134, %T A183543 51,84,85,139,86,141,142,231,46,76,77,126,78,128,129,210,80,131,132, %U A183543 215,133,217,218,354,83,136,137,223,138,225,226,367,140,228,229,372,230,374,375,608 %N A183543 Second of two complementary trees generated by the Wythoff sequences. %C A183543 See A183542. %F A183543 See the formulas as A074049 and A183545. %e A183543 First three levels: %e A183543 ...............3 %e A183543 .......6.............11 %e A183543 ....10...18.......19....32 %Y A183543 Cf. A074049, A183542, A183545. %K A183543 nonn,tabf %O A183543 1,1 %A A183543 _Clark Kimberling_, Jan 05 2011